benny is correct, if you want to pick up anything FTA, you need a larger dish (at least 90cm).
a few notes:
-signal strength doesnt mean anything. only the quality meter matters.
-some of the sats you list are not visible from the 'midwest', your indicated location. From the midwest, you will never get Koreasat or Intelsat xxx. see this link for everything viewable from your location:
http://www.lyngsat.com/america.html
-If you have a signal on AMC4, you may be getting some of the stonger FTA signals, but are not aligned to the satellie arc. see this link:
http://www.sadoun.net/viewtopic.php?t=5028
-The secret to getting a signal off of the Nimiq and Echostar sats is known as a "subscription". see these links:
http://www.dishnetwork.com
http://www.bell.ca/shop/PrsShpTvSna_Landing.page